def setUp(self):
d = Device(0, "test")
dc = DeviceConfig(0, "foo", d)
dc.base = 1000
dc.spacing = 1
dc.num = 1000
sc = SweepConfig(dc, 0, 3, 1)
p = SpectrumSensorProgram(sc, 0, 10, 1)
self.r = r = SpectrumSensorResult(p)
s = Sweep()
s.timestamp = 0.0
s.data = [0.0, 1.0, 2.0]
r.sweeps.append(s)
s = Sweep()
s.timestamp = 1.0
s.data = [3.0, 4.0]
r.sweeps.append(s)
def _decode(program, data):
num_channels = program.sweep_config.num_channels
line_bytes = num_channels * 2 + 4
result = SpectrumSensorResult(program)
sweep = Sweep()
for n in range(0, len(data), 2):
datum = data[n:n + 2]
if len(datum) != 2:
continue
if n % line_bytes == 0:
# got a time-stamp
t = data[n:n + 4]
tt = struct.unpack("<i", t)[0]
assert not sweep.data
sweep.timestamp = tt * 1e-3
continue
if n % line_bytes == 2:
# second part of a time-stamp, just ignore
assert not sweep.data
continue
dbm = struct.unpack("<h", datum)[0] * 1e-2
sweep.data.append(dbm)
if len(sweep.data) >= num_channels:
result.sweeps.append(sweep)
sweep = Sweep()
if (sweep.data):
result.sweeps.append(sweep)
return result
def sweep(self, sweep_config):
"""Perform a single frequency sweep and return results
immediately
:param sweep_config: frequency sweep configuration to use, a :py:class:`SweepConfig` object
"""
sweep = Sweep()
sweep.timestamp = 0
for sweep_config in self._split_sweep_config(sweep_config):
data = self._sweep(sweep_config)
sweep.data += data
return sweep
